#include "Date.h"
Date::Date(int year, int month, int day)
{
	_year = year;
	_month = month;
	_day = day;
}

bool Date::operator<(const Date& d)
{
  if(_year<d._year)
  {
    return true;
  }
  else  if(_year==d._year)
  {
      if(_month<d._month)
      {
        return true;
      }
      else if (_month==d._month)
      {
        if(_day<d._day)
        {
          return true;
        }
      }
    }
    return false;
}

// d1 <= d2
bool Date::operator<=(const Date& d) 
{
	return *this < d || *this == d;
}

bool Date::operator>(const Date& d)
{
	return !(*this <= d);
}

bool Date::operator>=(const Date& d)
{
	return !(*this < d);
}

bool Date::operator==(const Date& d)
{
	return _year == d._year
		&& _month == d._month
		&& _day == d._day;
}

bool Date::operator!=(const Date& d)
{
	return !(*this == d);
}

// d1 += 10
Date& Date::operator+=(int day)
{
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		++_month;
		if (_month == 13)
		{
			++_year;
			_month = 1;
		}
	}

	return *this;
}

Date Date::operator+(int day)
{
	//Date tmp(*this);
	Date tmp = *this; // 
	tmp += day;

	return tmp;
}

// d1 + 10
//Date Date::operator+(int day)
//{
//	//Date tmp(*this);
//	Date tmp = *this; // 
//
//	tmp._day += day;
//	while (tmp._day > GetMonthDay(tmp._year, tmp._month))
//	{
//		tmp._day -= GetMonthDay(tmp._year, tmp._month);
//		++tmp._month;
//		if (tmp._month == 13)
//		{
//			++tmp._year;
//			tmp._month = 1;
//		}
//	}
//
//	return tmp;
//}
//
//// d1 += 100
//Date& Date::operator+=(int day)
//{
//	*this = *this + day;
//
//	return *this;
//}

Date Date::operator-(int day)
{
	Date tmp = *this;
	tmp -= day;

	return tmp;
}

Date& Date::operator-=(int day)
{
	_day -= day;
	while (_day <= 0)
	{
		--_month;
		if (_month == 0)
		{
			--_year;
			_month = 12;
		}

		_day += GetMonthDay(_year, _month);
	}

	return *this;
}

// ++d ->d.operator++()
Date& Date::operator++()
{
	*this += 1;
	return *this;
}

// d++ ->d.operator++(0)
Date Date::operator++(int)
{
	Date tmp = *this;
	*this += 1;
	return tmp;
}

// d1 - d2
int Date::operator-(const Date& d)
{
	int flag = 1;
	Date max = *this;
	Date min = d;

	if (*this < d)
	{
		int flag = -1;
		max = d;
		min = *this;
	}

	int n = 0;
	while (min != max)
	{
		++min;
		++n;
	}

	return n * flag;
}
